Any reasonably in-shape person has nothing to fear with slow zombies. ****, you can just power-walk away.

that's not at all the point. the point is that, regardless of speed, you're fighting an army that has limitless resources--you kill one of them, they're gone (-1). they take one of yours and gain one at the same time (a swing of 2 for them). after a while, considering there are no logistics lines you can cut, they don't need food, water, sleep, there's no 'leadership' to assassinate, and they survive under the ocean, where there is no oxygen, etc--it's beyond a nightmare ALREADY. having them run is just bullshit.